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Author Topic: Design Details for a Water Wheel Test Rig  (Read 1920 times)
Lurk
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« on: February 03, 2012, 09:53:32 AM »

After reading the thread by our university student member - I quite fancy building a scale model test rig which I can manually lift into various streams in my area and record the power potential.  I do appreciate that each installation should be carefully measured to determine the most appropriate technology for head, flow, etc etc - humour me please, I want to try to get a bit of interest from the locals to see if we can get a community based project of the ground.

Can anyone recommend an online resource where I can get the design details / formulas for water wheels (stream wheel / undershot) which might enable me to come up with a design which I could link to a small variable speed gearbox and PMG with variable load.... (the later bit is a headache in itself)... any advise appreciated.
Lurk
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Lurk
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« Reply #1 on: February 04, 2012, 08:05:12 AM »

Not too many ideas then ?
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Richard Owen
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« Reply #2 on: February 04, 2012, 08:38:37 AM »

I think there are easier ways to measure power potential.

You can easily measure head with a long hose pipe and pressure gauge.

You can measure flow with an orange.

Unless the stream is flowing through very difficult terrain, you can take a reasonable stab at volume.

Once you've got those numbers, you know the power potential.
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Lurk
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« Reply #3 on: February 04, 2012, 10:01:50 AM »

I appreciate that Richard, but, nothing tells the story like showing a 'working model' lighting up bulbs for example. From the people I have talked with, their eyes glaze over as soon as I start mentioning 'potential'..maybe its me ! I am keen to hear how the model performed in the other thread...
That aside, I thought there must be a set of schematics that show the key design formula for water wheels of the under shot variety - the variable of flow rate can then be added to give the options for output at differing locations. Head is as I understand undershot wheels of less importance - thats why undershot and stream wheels were developed - i.e for little to know head locations.
Looks like I will have to try the books and patent papers from a long time back.
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guydewdney
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« Reply #4 on: February 04, 2012, 10:46:25 AM »

try a book called 'stronger than a hundred men' as a reasonable reference to scientific testing of waterwheels, but as undershot is quite inefficient, it has been superseded by sagebien / poncelot etc.

http://www.amazon.co.uk/Stronger-than-Hundred-Men-Technology/dp/0801872480/ref=sr_1_1?ie=UTF8&qid=1328352359&sr=8-1


edit - found on amazon
http://www.amazon.co.uk/Principles-Construction-Efficiency-Water-wheels-Donaldson/dp/0554931397/ref=pd_bxgy_b_text_b
« Last Edit: February 04, 2012, 10:49:53 AM by guydewdney » Logged

Pic of wheel on day 1
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Baz
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« Reply #5 on: February 04, 2012, 01:48:59 PM »

Our village looked at the possibility of a community water power project as we have several disused leats giving 100ft head in the village. No problem getting people interested. The 50k for the turbine install and volunteer labour to restore the leat all looked feasable. However it was instantly made unecenomic by a massive factor by the 50k environmental survey and 50k for bullshit paperwork to satisfy the National Park planners.
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Lurk
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« Reply #6 on: February 04, 2012, 01:53:22 PM »

Hi Baz - which Park are you in ?
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billi
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« Reply #7 on: February 04, 2012, 02:22:54 PM »

Here is  lots of  information unfortunately only in German ,  so i hope one can understand the google translate version

loads of  interesting  pics

http://translate.google.com/translate?sl=de&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.buch-der-synergie.de%2Fc_neu_html%2Fc_06_01_wasser_geschichte_wasserkraft_1.htm&act=url
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Lurk
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« Reply #8 on: February 04, 2012, 05:42:28 PM »

Cheers - lots of references and useful ideas. hours of fun !  extrahappy
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RobNute
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« Reply #9 on: February 06, 2012, 08:58:51 PM »

Hi Lurk, here are some things that you may find interesting.

http://www.waterwheelfactory.com/poncelet.htm

http://sleekfreak.ath.cx:81/3wdev/VITAHTML/SUBLEV/EN1/WTRWHEEL.HTM

http://www.navitron.org.uk/forum/index.php/topic,12399.0.html

I love the idea of a community based project but I wonder just how big an undershot wheel you would have to have to even cover a few houses electricity needs let alone a whole village etc, keep us posted.

Best wishes

Rob
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Lurk
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« Reply #10 on: February 07, 2012, 02:26:37 PM »

Thanks Rob, it will be interesting to see if the local interest and local gov' planners NRA etc etc can share a common goal - I have my own views !
Will keep you posted.

Lurk
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